Oh dear, poor you! Is he house-trained? With young puppies they usually cry because they need the toilet, or because they're lonely or both. With older dogs I'd imagine it's just a question of getting used to their surroundings, and would probably advise you to put in some ear-plugs and try to ignore it, so the dog learns that it won't get it wants on demand. Difficult one though. How many nights have you had him? It may just take a little while to settle in.